Análise da confiabilidade de duas plataformas de força para a coleta simultânea de variáveis dinâmicas para a identificação da assimetria bilateral

Abstract

Introduction: The bilateral asymmetry (BA) between limbs is considered as major cause of decreased performance and injury in sport. Early identification of the BA is important for the development of more adequate training and rehabilitation programs, reducing the possibility of injury and decreases in sports performance. One of the most widely used methods for the identification of BA is countermovement jump performed on a force platform. Several studies have already been conducted in this area and have demonstrated that the dynamic variables maximal force, impulse and power have a significant reliability in identifying asymmetries; however, on most of these studies the identification of asymmetries was done by jumps which were performed in a sequential or monopodal way. Objective: This study investigated the reliability of two force platforms, with simultaneous data collection of both lower limbs through the jump with countermovement in order to identify BA through the dynamic variables maximal force and impulse. Methodology: The study included 16 athletes of the Mineira Federation of Tae Kwon Do, with an average age of 20.00 ± 5.18 years and in average 10.68 ± 4.85 years of sports practice, including 3 females with an average mass of 59.36 ± 13.75 kg and average height of 166.66 ± 7.50 cm and 13 males with an average weight of 69.86 ± 16.40 kg and average height of 175.15 ± 7.72 cm. A single series containing six CMJ was carried out with no defined pauses between repetitions, the subject simply jumped and automatically prepared for the following jump. The collection was performed at a frequency of 1000 Hz. Results: The ICC values for maximal force were 0.900 and 0.864 for the right and left leg, respectively. For the impulse, the ICC values found were 0.941 and 0.937 for the right and left legs, respectively. Conclusion: The results indicate that the PFD showed reliability in the acquisition of the measurements for both variables, therefore validating this procedure on the identification of BA.